Use https when possible.

[ci skip]

docs/_includes/header.html

@@ -20,8 +20,8 @@
 <link href="{{ site.baseurl }}/assets/css/docs.min.css" rel="stylesheet">
 
 <!-- Google Web fonts -->
-<link href="http://fonts.googleapis.com/css?family=Roboto:300,400,400italic,500" rel="stylesheet">
+<link href="https://fonts.googleapis.com/css?family=Roboto:300,400,400italic,500" rel="stylesheet">
-<link href='http://fonts.googleapis.com/css?family=Source+Sans+Pro:400,300,400italic,600' rel='stylesheet' type='text/css'>
+<link href='https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,300,400italic,600' rel='stylesheet' type='text/css'>
 
 <!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
 <script src="{{ site.baseurl }}/assets/js/ie10-viewport-bug-workaround.js"></script>

docs/_plugins/callout.rb

@@ -1,4 +1,4 @@
-# Source: http://stackoverflow.com/questions/19169849/how-to-get-markdown-processed-content-in-jekyll-tag-plugin
+# Source: https://stackoverflow.com/questions/19169849/how-to-get-markdown-processed-content-in-jekyll-tag-plugin
 
 module Jekyll
   module Tags

docs/assets/scss/docs.scss

@@ -2,7 +2,7 @@
  * Bootstrap Docs (http://getbootstrap.com)
  * Copyright 2011-2015 Twitter, Inc.
  * Licensed under the Creative Commons Attribution 3.0 Unported License. For
- * details, see http://creativecommons.org/licenses/by/3.0/.
+ * details, see https://creativecommons.org/licenses/by/3.0/.
  */
 
 // Dev notes

docs/components/forms.md

@@ -603,7 +603,7 @@ We hide the default `<input>` with `opacity` and use the `.c-indicator` to build
 
 With the sibling selector (`~`), we use the `:checked` state to trigger a makeshift checked state on the custom control.
 
-In the checked states, we use **base64 embedded SVG icons** from [Open Iconic](http://useiconic.com/open). This provides us the best control for styling and positioning across browsers and devices.
+In the checked states, we use **base64 embedded SVG icons** from [Open Iconic](https://useiconic.com/open). This provides us the best control for styling and positioning across browsers and devices.
 
 #### Checkboxes
 

docs/components/modal.md

@@ -180,7 +180,7 @@ Additionally, you may give a description of your modal dialog with `aria-describ
 {% callout info %}
 #### Embedding YouTube videos
 
-Embedding YouTube videos in modals requires additional JavaScript not in Bootstrap to automatically stop playback and more. [See this helpful Stack Overflow post](http://stackoverflow.com/questions/18622508/bootstrap-3-and-youtube-in-modal) for more information.
+Embedding YouTube videos in modals requires additional JavaScript not in Bootstrap to automatically stop playback and more. [See this helpful Stack Overflow post](https://stackoverflow.com/questions/18622508/bootstrap-3-and-youtube-in-modal) for more information.
 {% endcallout %}
 
 ## Optional sizes
@@ -316,7 +316,7 @@ To take advantage of the Bootstrap grid system within a modal, just nest `.conta
 
 ## Varying modal content based on trigger button
 
-Have a bunch of buttons that all trigger the same modal, just with slightly different contents? Use `event.relatedTarget` and [HTML `data-*` attributes](https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Using_data_attributes) (possibly [via jQuery](http://api.jquery.com/data/)) to vary the contents of the modal depending on which button was clicked. See the Modal Events docs for details on `relatedTarget`.
+Have a bunch of buttons that all trigger the same modal, just with slightly different contents? Use `event.relatedTarget` and [HTML `data-*` attributes](https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Using_data_attributes) (possibly [via jQuery](https://api.jquery.com/data/)) to vary the contents of the modal depending on which button was clicked. See the Modal Events docs for details on `relatedTarget`.
 
 {% example html %}
 <div class="bd-example">

docs/components/scrollspy.md

@@ -96,7 +96,7 @@ Navbar links must have resolvable id targets. For example, a `<a href="#home">ho
 {% callout info %}
 #### Non-`:visible` target elements ignored
 
-Target elements that are not [`:visible` according to jQuery](http://api.jquery.com/visible-selector/) will be ignored and their corresponding nav items will never be highlighted.
+Target elements that are not [`:visible` according to jQuery](https://api.jquery.com/visible-selector/) will be ignored and their corresponding nav items will never be highlighted.
 {% endcallout %}
 
 ### Methods

docs/getting-started/browsers-devices.md

@@ -143,7 +143,7 @@ As of v4, Bootstrap no longer supports IE8. **If you require IE8 support, we rec
 
 Alternatively, you may add some third party JavaScript to backfill support for IE8 to Bootstrap 4. You'll need the following:
 
-* [The HTML5 shiv](http://en.wikipedia.org/wiki/HTML5_Shiv)
+* [The HTML5 shiv](https://en.wikipedia.org/wiki/HTML5_Shiv)
 * [Respond.js](https://github.com/scottjehl/Respond)
 * [Rem unit polyfill](https://github.com/chuckcarpenter/REM-unit-polyfill)